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Subject[RFC PATCH v4 8/8] drm/rockchip: Add device links for master and components
Date
Since we are trying to access components' resources in the master's
suspend/resume PM callbacks(e.g. panel), add device links to correct
the suspend/resume and shutdown ordering.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2:
Use device link to correct the suspend/resume and shutdown ordering,
instead of converting rockchip spi's suspend/resume PM callbacks to
late suspend/resume PM callbacks.

drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 76d63de5921d..af18967f699b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -337,6 +337,8 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)

if (!d)
break;
+
+ device_link_add(dev, d, DL_FLAG_STATELESS);
component_match_add(dev, &match, compare_dev, d);
} while (true);
}
@@ -406,6 +408,7 @@ static int rockchip_drm_platform_of_probe(struct device *dev)
static int rockchip_drm_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct device_link *link;
struct component_match *match = NULL;
int ret;

@@ -414,16 +417,31 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
return ret;

match = rockchip_drm_match_add(dev);
- if (IS_ERR(match))
- return PTR_ERR(match);
+ if (IS_ERR(match)) {
+ ret = PTR_ERR(match);
+ goto err_cleanup_dev_links;
+ }

- return component_master_add_with_match(dev, &rockchip_drm_ops, match);
+ ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
+ if (ret < 0)
+ goto err_cleanup_dev_links;
+
+ return 0;
+err_cleanup_dev_links:
+ list_for_each_entry(link, &dev->links.consumers, s_node)
+ device_link_del(link);
+ return ret;
}

static int rockchip_drm_platform_remove(struct platform_device *pdev)
{
+ struct device_link *link;
+
component_master_del(&pdev->dev, &rockchip_drm_ops);

+ list_for_each_entry(link, &pdev->dev.links.consumers, s_node)
+ device_link_del(link);
+
return 0;
}

--
2.11.0

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